The minimum and maximum age for a candidate to contest elections for President of India’s office?

Consider the following statements: 

1. Most oil & gas exporting countries are using the US dollar for their transaction
2. Most oil & gas exporting countries are using Asian Clearing Union Mechanism for settlement

Which among the above statements is / are correct?

Natwari Nritya is associated to which of the following classical dance forms?

Consider the following statements with respect to the Thermionic emission:
1. It is caused by electrons or ions that break loose from the metal surface due to heat energy
2. A metal cannot emit thermions at all temperatures
Which among the above statements is / are correct ?

With reference to sericulture in India, the government has planned around 100 bivoltine silk production clusters in the 12th Plan 2012-2017. Consider the following statements with this reference:
1. Bivoltine is a breed of mulberry silkmoth which produces two generations a year
2. In India, major type of silk produced is of multivoltine in nature than bivoltines
Which among the above statements is / are correct?